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The limits to population density in birds and mammals.

Stephens, P.A. and Vieira, M.V. and Willis, S.G. and Carbone, C. (2019) 'The limits to population density in birds and mammals.', Ecology letters., 22 (4). pp. 654-663.


We address two fundamental ecological questions: what are the limits to animal population density and what determines those limits? We develop simple alternative models to predict population limits in relation to body mass. A model assuming that within‐species area use increases with the square of daily travel distance broadly predicts the scaling of empirical extremes of minimum density across birds and mammals. Consistent with model predictions, the estimated density range for a given mass, ‘population scope’, is greater for birds than for mammals. However, unlike mammals and carnivorous birds, expected broad relationships between body mass and density extremes are not supported by data on herbivorous and omnivorous birds. Our results suggest that simple constraints on mobility and energy use/supply are major determinants of the scaling of density limits, but further understanding of interactions between dietary constraints and density limits are needed to predict future wildlife population responses to anthropogenic threats.

Item Type:Article
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Publisher statement:© 2019 The Authors Ecology Letters published by CNRS and John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Date accepted:28 December 2018
Date deposited:10 January 2019
Date of first online publication:06 February 2019
Date first made open access:No date available

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